Question

How many grams of salt should be dissolved in 60gram of water so as to prepare 15%W/W solution

Answer 1

${\huge{\underline{\underline{\mathfrak{\green{Answer:-}}}}}}$

Hey Mate!!

Let weight of solute be x and weight of solvent be y.

Formula for W/W solution:

$\frac{x}{x + y} \times 100 \\ = > \frac{x}{x + 60} \times 100 = 15 \\ = > x = \frac{15}{100} \times (x + 60) \\ = > x = \frac{3}{20} (x + 60) \\ = > x = \frac{3}{20} x + \frac{3}{20} \times 60 \\ = > x - \frac{3}{20} x= 3 \times 3 \\ = > \frac{20 - 3}{20}x = 9 \\ = > \frac{17}{20} x = 9 \\ = > x = 9 \times \frac{20}{17} \\ = > x = \frac{180}{17} \\ = > x = 10.6 \: grams \: (approx.)$

Answer 2

Answer:

A = 10.588

so, A = 10.6gm

Explanation:

w/w = A/a + b × 100

so,

A/a + b × 100

now,

A/a + 60 × 100 = 15

∴A= 15/100 × (a + 60)

∴A= 3/20 × (a + 60)

∴A= 3/20a × 3/20 × 60

∴A= 3/20a + 9

∴A= 3a + 180/20

∴20A = 3a + 180

∴20A - 3a = 180

∴17A = 180

∴A = 180/17

∴A = 10.588

∴A = 10.6 ( approx. )

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